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Intel Alder Lake-S Core-1800 ES specs leak: 16C/24T with 4.6 GHz boost on two big cores, 3.4 GHz boost on four small cores, and extremely short 228 W PL2

Intel 12th gen Alder Lake-S Core-1800 ES can boost up to 4.6 GHz on two cores. (Image Source: Videocardz)
Intel 12th gen Alder Lake-S Core-1800 ES can boost up to 4.6 GHz on two cores. (Image Source: Videocardz)
Leaked technical specifications of an Alder Lake-S Core-1800 16-core 24-thread engineering sample (ES) indicate a TDP of 125 W and a PL2 of 228 W that lasts for just 2.44 ms. We also get to know that this Core-1800 ES sample can boost up to 4.6 GHz on two Golden Cove cores and up to 3.4 GHz on four Gracemont Atom cores at 1.3147 V.
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Alder Lake is Intel's upcoming processor family, which is said to sport a hybrid core architecture that the company first experimented with Lakefield. So far, we have seen several instances of a 16-core Alder Lake processor in the wild. Now, Igor'sLAB has managed to source some technical information pertaining to what is being referred to as an Intel Core-1800 chip.

The Intel Core-1800 looks to be an engineering sample (ES), given its low base frequency of 1.8 GHz and early B0 stepping. The datasheet indicates the 16-core 24-thread processor to have eight Atom efficiency cores (which would be Gracemont cores without hyperthreading) and eight performance cores (Golden Cove with hyperthreading).

Also being indicated is that the Core-1800 ES has a PL1 (TDP) of 125 W that lasts for 56 seconds. The short-burst PL2 goes up to 228 W and lasts for just 2.44 ms. The PL2 value in this engineering sample is quite intriguing. It looks to be somewhat lower than the 251 W PL2 seen in Rocket Lake 8-core while also being of an extremely short duration. Both Rocket Lake 8-core and Comet Lake 10-core have a PL2 Tau that can last for up to 56 seconds. It is quite possible that this Core-1800 engineering sample cannot sustain the boost clock for long.

In any case, motherboard manufacturers often override Intel's PL2 and Tau values, so it will be interesting to see how well Alder Lake sustains boost. Also, we are hearing that Alder Lake will not be supporting the power-guzzling AVX-512 instruction set. This is understandable considering the platform is a heterogeneous architecture, which means supporting different ISAs simultaneously for both CPU clusters may not be possible given potential issues with proper scheduling.

Apart from the power values, the datasheet also shows the turbo ratio limits for the Golden Coves and Gracemont cores at a 1.3147 V voltage. At this voltage, the big Golden Cove cores can attain:

  • 4.6 GHz on 1-2 cores
  • 4.4 GHz on 3-4 cores
  • 4.2 GHz on 5-6 cores
  • 4 GHz on all 8 cores

The Gracemont Atom cores, on the other hand, can reach:

  • 3.4 GHz on 1-4 cores
  • 3 GHz on all 8 cores

Alder Lake can support DDR5-4800 memory but only when paired with high-end Z690 chipset boards, which can also support DDR4-3200. Other 600-series chipset boards will offer only DDR4-3200 support. This makes sense considering that there's still some uncertainty regarding mass production of DDR5 memory.

Alder Lake will also be the first mainstream desktop platform to support PCIe Gen5 with the CPU offering a total of 20 PCIe lanes (16 Gen5 + 4 Gen4). The PCH will offer another 28 PCIe lanes (16 Gen4 + 12 Gen3).

Intel hasn't given an exact timeline for Alder Lake's launch, but we expect an announcement sometime in September. Speculations currently point to anywhere between 20% and 25% IPC improvements for the Golden Cove cores over Willow Cove.

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Purported Intel Alder Lake-S Core-1800 ES technical specifications. (Source: Igor'sLAB)
Purported Intel Alder Lake-S Core-1800 ES technical specifications. (Source: Igor'sLAB)

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Vaidyanathan Subramaniam
Vaidyanathan Subramaniam - Managing Editor - 1358 articles published on Notebookcheck since 2012
Though a cell and molecular biologist by training, I have been drawn towards computers from a very young age ever since I got my first PC in 1998. My passion for technology grew quite exponentially with the times, and it has been an incredible experience from being a much solicited source for tech advice and troubleshooting among family and friends to joining Notebookcheck in 2017 as a professional tech journalist. Now, I am a Lead Editor at Notebookcheck covering news and reviews encompassing a wide gamut of the technology landscape for Indian and global audiences. When I am not hunting for the next big story or taking complex measurements for reviews, you can find me unwinding to a nice read, listening to some soulful music, or trying out a new game.
contact me via: @Geeky_Vaidy
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> Notebook / Laptop Reviews and News > News > News Archive > Newsarchive 2021 05 > Intel Alder Lake-S Core-1800 ES specs leak: 16C/24T with 4.6 GHz boost on two big cores, 3.4 GHz boost on four small cores, and extremely short 228 W PL2
Vaidyanathan Subramaniam, 2021-05- 5 (Update: 2021-05- 5)